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Hence, asynchronous code is also a great place to use arrow functions to make the code more concise and readable. With arrow functions the this keyword always represents the object that defined the arrow function. JavaScript arrow functions are roughly the equivalent of lambda functions in python or blocks in Ruby. But as a side effect, it could be cryptic when many arrow functions are nested.Let’s consider the following scenario. To study them in-depth, we first need to get to know some other aspects of JavaScript, so we’ll return to arrow functions later in the chapter Arrow functions revisited. when the user clicks a button.The first example uses a regular function, and the second example uses an It cannot replace the regular function in some situations. If you'd like to contribute to the data, please check out You cannot use bind to change the value of this inside an arrow function.
But for the most part, arrow functions are usually used for array manipulation with some methods such as Checking fruits have the price greater than or equal 20:As we can see, using arrow functions in those case make the code looks pretty clear and concise. I like about arrow functions the ability to compose short inline functions.For example, instead of using the long form of an arrow function:When the function has one expression, a good practice is to inline the arrow function.When these comparison operators are used in an inline arrow function, it creates some confusion.To distinguish clearly the fat arrow from the comparison operator, the first option is to wrap the expression into a pair of parentheses:The second option is to deliberately define the arrow function using a longer form:These refactorings eliminate the confusion between fat arrow symbol and comparison operators.An object literal inside an inline arrow function triggers a syntax error:JavaScript considers the curly braces a code block, rather than an object literal.Wrapping the object literal into a pair of parentheses solves the problem:If the object literal has lots of properties, you can even use newlines, while still keeping the arrow function inline:Wrap object literals into a pair of parentheses when used inside inline arrow functions.The arrow function syntax is short, which is good. Next, the If your function just has a single expression, you can omit the curly brackets, the When doing this, the arrow function allows you to have an If you write a block of code inside the brackets to contain your function’s body, even if it is just a single statement, you still have to explicitly use the return keyword if you want to return something.In case you want to implicitly return an object, make sure wrapping it inside parenthesis to avoid confusion:When the function has only one parameter, the parentheses surrounding this is optional:If the function has two or more than two parameters, the parentheses are mandatorily required, the same rule applies with a function has no parameter:Some advanced syntaxes with rest and default parameters in ES6 are also supported in arrow functions:We will learn more about spread operator, rest and default parameters in upcoming articles.The “this” keyword might be one of the most elusive parts in JavaScript. They cannot be called with the Now we have learned the basic syntax of the arrow function and saw some of its use cases. For now, we can already use arrow functions for one-line actions and callbacks.
JavaScript ES6 or ECMAScript 2015 is actually the biggest update made to ECMAScript since the first edition released in 1997.
Hence, asynchronous code is also a great place to use arrow functions to make the code more concise and readable. With arrow functions the this keyword always represents the object that defined the arrow function. JavaScript arrow functions are roughly the equivalent of lambda functions in python or blocks in Ruby. But as a side effect, it could be cryptic when many arrow functions are nested.Let’s consider the following scenario. To study them in-depth, we first need to get to know some other aspects of JavaScript, so we’ll return to arrow functions later in the chapter Arrow functions revisited. when the user clicks a button.The first example uses a regular function, and the second example uses an It cannot replace the regular function in some situations. If you'd like to contribute to the data, please check out You cannot use bind to change the value of this inside an arrow function.
But for the most part, arrow functions are usually used for array manipulation with some methods such as Checking fruits have the price greater than or equal 20:As we can see, using arrow functions in those case make the code looks pretty clear and concise. I like about arrow functions the ability to compose short inline functions.For example, instead of using the long form of an arrow function:When the function has one expression, a good practice is to inline the arrow function.When these comparison operators are used in an inline arrow function, it creates some confusion.To distinguish clearly the fat arrow from the comparison operator, the first option is to wrap the expression into a pair of parentheses:The second option is to deliberately define the arrow function using a longer form:These refactorings eliminate the confusion between fat arrow symbol and comparison operators.An object literal inside an inline arrow function triggers a syntax error:JavaScript considers the curly braces a code block, rather than an object literal.Wrapping the object literal into a pair of parentheses solves the problem:If the object literal has lots of properties, you can even use newlines, while still keeping the arrow function inline:Wrap object literals into a pair of parentheses when used inside inline arrow functions.The arrow function syntax is short, which is good. Next, the If your function just has a single expression, you can omit the curly brackets, the When doing this, the arrow function allows you to have an If you write a block of code inside the brackets to contain your function’s body, even if it is just a single statement, you still have to explicitly use the return keyword if you want to return something.In case you want to implicitly return an object, make sure wrapping it inside parenthesis to avoid confusion:When the function has only one parameter, the parentheses surrounding this is optional:If the function has two or more than two parameters, the parentheses are mandatorily required, the same rule applies with a function has no parameter:Some advanced syntaxes with rest and default parameters in ES6 are also supported in arrow functions:We will learn more about spread operator, rest and default parameters in upcoming articles.The “this” keyword might be one of the most elusive parts in JavaScript. They cannot be called with the Now we have learned the basic syntax of the arrow function and saw some of its use cases. For now, we can already use arrow functions for one-line actions and callbacks.
JavaScript ES6 or ECMAScript 2015 is actually the biggest update made to ECMAScript since the first edition released in 1997.